main {
  width: 100%;
  height: 94vh;
  display: flex;
}

main #left {
  width: 220px;
}

main #left #accordionExample .card .card-header {
  background-color: #eeeeee;
  padding: 0;
}

main #left #accordionExample .card .card-header .mb-0 .btn {
  padding: 10px 30px;
  width: 218px;
  height: 51px;
  font-weight: bold;
  color: #0056b3;
}

main #left #accordionExample .card .card-header .mb-0 .btn:hover {
  text-decoration: none;
}

main #left #accordionExample .card .card-header .mb-0 .btn:focus {
  border: none;
}

main #left #accordionExample .card .collapse .card-body {
  padding: 0;
}

main #left #accordionExample .card .collapse .card-body .row .col-3 .nav a {
  display: block;
  text-align: center;
  color: #0056b3;
  margin: 0;
  height: 40px;
  line-height: 40px;
  background-color: #f8f8f8;
  width: 218px;
  padding: 0;
}

main #left #accordionExample .card .collapse .card-body .row .col-3 .nav a:hover {
  background-color: #f1f1f1;
}

main #right {
  width: 1580px;
  height: 700px;
  margin: auto;
  margin-top: 30px;
}

main #right .row .col-9 {
  width: 1580px;
}

main #right .row .col-9 .tab-content {
  width: 1580px;
}

main #right .row .col-9 .tab-content .tab-pane {
  width: 1580px;
}

main #right .row .col-9 .tab-content .tab-pane .right_head {
  width: 100%;
  font-size: 30px;
  font-weight: bold;
  border-bottom: 1px solid;
}

.nav-pills .nav-link.active,
.nav-pills .show > .nav-link {
  color: #fff;
  background-color: #f8f8f8;
}









main > aside  {
  width: 220px;
  background-color: #f8f8f8;
  border-right: 1px solid #e7e7e7;
}

dt {
  font-weight: bold;
  border-bottom: 1px solid #e7e7e7;
  border-top: 1px solid #e7e7e7;
  background-color: #eeeeee;
  padding-left: 60px;
  cursor: default;
}

dd {
  text-align: center;
  display: none;
}

dd:hover {
  background-color: #f1f1f1;
  color: #255d8d;
}

dl, dt, dd {
  line-height: 40px;
  color: #337ab7;
}

dd.active {
  background-color: #f1f1f1;
  color: #255d8d;
}

section {
  padding: 30px;
  flex-grow: 1;
}

.section-content h2 {
  font-size: 36px;
  border-bottom: 1px solid #e7e7e7;
  padding-bottom: 10px;
}

.section-content .content {
  padding: 20px;
}


#studentsAdd .content-info> div, #studentsUpdate .content-info> div {
  display: flex;
}

table {
  width: 100%;
  text-align: center;
}


table, th, td {
  border: 1px solid #ddd;
  border-collapse: collapse;
}

th, td {
  padding: 10px 0;
}

tbody tr:nth-child(2n - 1) {
  background-color: #f5f5f5;
} 

.form-content input[type=radio], .form-content input[type=checkbox] {
  vertical-align: -1px;
}

.right-info {
  margin-left: 100px;
}


.image-frame {
  border: 1px dashed #ddd;
  width: 180px;
  height: 180px;
  border-radius: 5px;
}

.image-frame > img{
  width: 100%;
  height: 100%;
}



.search-frame {
  width: 250px;
  height: 30px;
  border-radius: 5px;
  display: flex;
  border: 1px solid #ddd;
  overflow: hidden;
  padding-left: 10px;
}

.search-frame > * {
  border-radius: 0px;
  border: none;
  outline: none;
}

.search-frame > input {
  flex-grow: 1;
  border-left: 1px solid #ddd;
  text-indent: 10px;
}

.checkbox-frame > label {
  display: block;
  margin-bottom: 10px;
}